Why won't songs from "iTunes" play on a Denon 4500 player?

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One word DRM.
 
Big Media describe DRM as Digital Rights Management. However, since its purpose is to restrict you the user, it is more accurate to describe DRM as Digital Restrictions Management. DRM Technology can restricts users’ access to movies, music, literature and software, indeed all forms of digital data.

The previous post was correct about needing to convert itunes M4a files to MP3. Unless your unit is an apple...it probably wont read or play M4a files.
 
After converting from whatever format to another lossy format(mp3) you are now at least 2 generations away from the original. Alos if there is no tags in the file converting them will not magically bring them back.
 
Tags? Like artist and info like that?
If that's what you guys mean by tags then YES, converting to mp3 does make them show up on windows. I've confirmed this only on win7 and vista, though.
 
I tunes will convert "in bulk"

How do you do it?

EDIT:scratch that. (lol) I just realized you can multiselect on the new itunes. You couldn't on the old one haha
The only issue I see with making iTunes do it is that it'll still save the files in it's own organized folders. If you use the program you can create a special folder to put all of your conversions in as opposed to manually searching for them after converting.